Roll suction-box for paper-making machines



(NoModeL) 2 Sheets-Sheet 1 J. RANDALL. ROLL SUCTION ox FOR PAPER MAKING MAGHINBS.

Patented Apr. 4,1882. 1

i Invenior: 2/02 M (No Model.) 2 Sheets- Sheet 2.

J. RANDALL. ROLL SUGTION BOX FOR PAPER MAKING MACHINES.

N0.--256,04'7. Patented Apr. 4,1882.

V UNITED STATES ATENT OFFICE.

JAMES RANDALL, OF NORWICH, CONNECTICUT.

ROLL SUCTION-BOX FOR PAfER-MAKING MACHINES.

, SPECIFICATION forming part of Letters Patent No. 256,047, dated Apri14, 1882.

Application filed February 18, 1882. (No model.)

To all whom it may concern:

Be it known that 1, JAMES RANDALL, a citizen, of the United States, residing at Norwich,

in the countyof New London and Stateof Connecticut, have invented a new and useful Improvement in Roll Suction-Boxes for Paper- Making Machines, of which the following is a specification.

Sheet 1, Figure 1 is a perspective view of the suction-box. Sheet 1, Fig. 2 is a vertical cross-section of the same. Sheet 2, Fig. 1 is a plan view of a modification and preferred form of suction-box. Sheet 2, Fig. 2 is a vertical section of the same, taken through the loose sleeves near the rubber belt.

Like letters denote like parts.

The object of this invention is to do away with the great friction and wear of the wirecloth attendant upon the use of most suctionboxes before invented, and at the same time to avoid the somewhat complicated construction attendant upon water-seals for the rollers.

, This invention consists in the combination of open or perforated metal rollers upon which the wire-cloth rests, and over which it passes, said rollers being journaled in the sides of a rectangular box, rollers in brackets upon the outer side of the box, four band-pulleys over which two endless belts pass in the direction of the moving wire-cloth, afeltpacking around the edge of the suction-box, and a loose sleeve surrounding each end of the perforated rollers, by the adjustment of which paper of various widthsmay be operated upon by the same suction-box, all as hereinafter fully described.

B B represent two of the sides of a rectangular box, equal in length to the width of the wire-cloth under which it is to be used.

E E E E represent four light hollow metal rollers, perforated, as shown.

A A represent two solid rollers mounted in brackets or hangers b at the corners of the suction-box.

C C are two belts of rubber passing over the band-pulleysc a a a.

d d are pieces of felt or any suitable packing placed upon the edges of the four sides "of the box.

ff in Fi 2 is the wire-cloth, which rests prlilucipally upon the solid or unperforated ro s.

G is the hole in the bottom of the box, in I ff of course'rests the semi-liquid paper-pulp.

This wire-cloth passes'over the four perforated rolls in the box, and the two solid rolls outside and directly underneath the rubber belts c c, by which it is pressed closely down upon the felt packing at the side of the box. The friction of the wire-clothupon the box is very slight, as it slides easily along the felt, carrying with it the belt, and moves readily over the six rollers. The air being exhausted from the box draws the water from the pulp through the wire-cloth, tending rapidly to dry it and make it solid. It will be readily seen that from the rollers being perforated the exhaust is constantly going on, even upon parts of the wire-cloth resting upon the said rolls.

The belts tend to keep the wire-cloth from jumping or raising at its edges from the felt packing. The ends of the rollers E E E E adjust vertically in theirjournals inside the box in any well known way, as may the rollers and band-pulleys in the corner-brackets b.

The preferred form of box I have shown in Sheet 2 of drawings. It has the perforated rollers, and also the endless belts,to move with the wire-cloth and hold it closely to the felt packing; but in this form is added another important feature-via, loose sleeves adjust ing upon the ends of the perforated rollers to accommodate them to varying widths of paper. In this form, also, the outer supporting solid rollers to sustain the weightot the wirecloth are shown within the box, instead of outside the same, and a portion of the side of the box is curved inwardly, the better to embrace it. The hollow rolls, only three of which are here shown, though any number may be used, are made smaller for a short distance from each end, with a square shoulder, against which abuts the edge of a sleeve that readily rotates thereon.

In Fig. 1 of Sheet 2 of the drawingsthe sleeve may be seen extending about one-quarter of the length of the roll, and upon each end thereof. The line running across shows where the large part of roll meets the edge of the loose sleeve D. These loose sleeves, six in number, are provided, as seen in the drawings, with lines of three holes, then two, and lastly one. Now, when this loose sleeve is rotated so that the line of three holes registers with the three holes underneath of the reduced part of the main roll, then paper of the greatest width is dried, for the air can be drawn through the perforations the en tire length of the hollow perforated rolls. Now, if each loose sleeve be turned slightly to the left, only two of its perforations will register with the two holes of the main roll underneath,while the outer holes of each roll will be covered by the solid part of the sleeve. In this way paper slightly narrower can be dried. Next, let each sleeve be turned still farther to the left, and but a single hole registers with the hole of the main roll underneath,while two are covered up. Lastly, if the sleeve be turned still farther to the left, it covers with its solid portion all the holes under the sleeves, and paper is dried of a width just equal to the space within the lines where the sleeves meet the center part of rolls that are of greater diameter. Were itnot for theloose perforated sleeves, only paper of one width could be readily dried by my suction-box; forifnarrower paper passed over the central parts of the perforated rolls, air would find its way easily into the exhaustbox, not through the pulp or soft paper, but through the exposed ends of the roll.

K simply shows the drum over which the endless belt of wire-cloth passes.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. The combination, in a suction-box, of the perforated metal rolls, journaled in its sides, and the solid exterior rolls, A A, for supporting the wire-cloth of a paper-machine, all as and for the purposes set forth.

2. The combination of felt packing upon the edges of the suction-box and the endless rubber belts passing over band-pulleys at the corners of said box to move with the wire-cloth and hold it down, all substantially as herein set forth. 7 1

3. In combination with the hollow perforated rolls of a suction-box, the loose perforated sleeves for adapting the same length of rolls to be used with varying widths of paper, all substantially as described.

JAMES RANDALL.

Witnesses:

H. H. BURNHAM, JOHN G. KELLOGG. 

